An abnormal mass that results from the excessive, unabated and unnecessary growth of cells. Tumours, also sometimes referred to as lesions, may be benign or malignant.
Malignant tumours cause more concern as they have the ability to spread and invade other parts of the body, disrupting essential functions. Malignant cancer cells often spread to other parts of the body, travelling via the blood stream or the lymphatic system. This is referred to as metastasis.
Benign tumours are not cancerous and can often be removed without returning and for this reason they are rarely a threat to life, unless they are located in a position which can compromise organ function.
Treatment of tumours depends on their type, size and whether they have spread to other parts of the body.